Common valve materials commonly used austenitic - ferritic duplex stainless steel castings, forgings material chemical composition status Grade Chemical composition /% (except for the range given for the maximum) Reference Standard C Mn Si p S Cr Ni Mo Cu W N casting IB (CD4MCuN) 0.04 1.00 1.00 0.04 0.04 24.5-26.5 4.7-6.0 1.7-2.3 2.7-3.3  0.10-0.25 ASTM A 995 ASTM A 890 4A (CD3MN) 0.03 1.50 1.00 0.04 0.02 21.0-23.5 4.5-6.5 2.5-3.5 1.00  0.10-0.30 5A (CE3MN) 0.03 1.50 1.00 0.04 0.04 24.0-26.0 6.0-8.0 4.0-5.0   0.10-0.30 6A (CD3MWCuN) 0.03 1.00 1.00 0.030 0.025 24.0-26.0 6.5-8.5 3.0-4.0 0.5-1.0 0.5-1.0 0.20-0.30 Forgings F 51 0.03 2.00 1.00 0.030 0.020 21.0-23.0 4.5-6.5 2.5-3.5   0.08-0.20 ASTM A 182 F 53 0.03 1.20 0.80 0.035 0.020 24.0-26.0 6.0-8.0 3.0-5.0 0.5  0.24-0.32 F 55 0.03 1.00 1.00 0.030 0.010 24.0-26.0 6.0-8.0 3.0-4.0 0.5-1.0 0.5-1.0 0.20-0.30  ã€Print】 ã€Close】